diff mbox series

[v2,05/18] drm/sun4i: Force the mixer rate at 150MHz

Message ID 55becb3a86a0a28ccca3f7c831ac6f6cf4854390.1511797218.git-series.maxime.ripard@free-electrons.com
State New
Headers show
Series drm/sun4i: Add A83t LVDS support | expand

Commit Message

Maxime Ripard Nov. 27, 2017, 3:41 p.m. UTC 
It seems like the mixer can only run properly when clocked at 150MHz. In
order to have something more robust than simply a fire-and-forget
assigned-clocks-rate, let's put that in the code.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 drivers/gpu/drm/sun4i/sun8i_mixer.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index cb193c5f1686..c0cdccf772a2 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -315,6 +315,13 @@  static int sun8i_mixer_bind(struct device *dev, struct device *master,
 	}
 	clk_prepare_enable(mixer->mod_clk);
 
+	/*
+	 * It seems that we need to enforce that rate for whatever
+	 * reason for the mixer to be functional. Make sure it's the
+	 * case.
+	 */
+	clk_set_rate(mixer->mod_clk, 150000000);
+
 	list_add_tail(&mixer->engine.list, &drv->engine_list);
 
 	/* Reset the registers */